Based on the overexploitation of real estate in urban waterfront the paper elucidates the result of its negative influence to urban ecosystem and evolvement, we take Nanjing as an example, point out overexploitation of real estate is the main factor of accelerating the problems of 'aquatic ecosystem', 'water evolvement', 'landscape' and 'urban heat island', discuss the countermeasures to the problem, point out the importance of legislation and planning as well as the importance of constructing urban-wide 'aquatic ecosystem' and intensifying education and propagandism, provide some measures in public opinion supervision, and emphasize government should play the leading function in the whole process.